Universal studios in Hollywood is the 1st of two that operate. This is the original one and films are still shot here all the time. The second and bigger location is in Florida. No films are shot @ the Florida one though. So wouldn’t you rather go to the one where your favorite movie or TV show was made. Plus, can’t beat the awesome weather in Los Angeles.
The Halloween deal is just awesome! You get to walk on the backlots. They only do this in October for Halloween Horror Nights.